21525652564731 has 96 divisors (see below), whose sum is σ = 37193435136000. Its totient is φ = 11729439513792.

The previous prime is 21525652564729. The next prime is 21525652564753. The reversal of 21525652564731 is 13746525652512.

21525652564731 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 5 + 6 + 5 + 2 + 564 + 73 + 1 = 666.

It is not a de Polignac number, because 21525652564731 - 2¹ = 21525652564729 is a prime.

It is a super-2 number, since 2×21525652564731² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21525652564711) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 652295770 + ... + 652328768.

It is an arithmetic number, because the mean of its divisors is an integer number (387431616000).

Almost surely, 2^{21525652564731} is an apocalyptic number.

21525652564731 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21525652564731 is a deficient number, since it is larger than the sum of its proper divisors (15667782571269).

21525652564731 is a wasteful number, since it uses less digits than its factorization.

21525652564731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34405 (or 34402 counting only the distinct ones).

The product of its digits is 15120000, while the sum is 54.

The spelling of 21525652564731 in words is "twenty-one trillion, five hundred twenty-five billion, six hundred fifty-two million, five hundred sixty-four thousand, seven hundred thirty-one".